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fix: harden DSC decoder against noise-induced false decodes

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Stricter dot pattern detection (200 bits/100 alternations), bounded
phasing strip (max 7), symbol check bit parity validation, EOS minimum
position check, strict MMSI decode (reject out-of-range symbols),
format-aware telecommand extraction, and expanded critical category
detection.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Smittix
2026-02-26 22:52:41 +00:00
parent ee81eb44cd
commit 645b3b8632
4 changed files with 164 additions and 25 deletions
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5
utils/dsc/parser.py
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@@ -248,7 +248,10 @@ def parse_dsc_message(raw_line: str) -> dict[str, Any] | None:
msg['priority'] = get_category_priority(msg['category'])
# Mark if this is a critical alert
msg['is_critical'] = msg['category'] in ('DISTRESS', 'ALL_SHIPS_URGENCY_SAFETY')
msg['is_critical'] = msg['category'] in (
'DISTRESS', 'DISTRESS_ACK', 'DISTRESS_RELAY',
'URGENCY', 'SAFETY', 'ALL_SHIPS_URGENCY_SAFETY',
)
return msg